Bus Fault

[PeterFromSweden]

This simple program causes a bus fault?!?

int main(void){  uint32_t tmp;  tmp = PORTD_PCR14; // <-- Causes HardFault or BusFault?!?                     // SCB_HFSR = 0x40000000                     // SCB_CFSR = 0x8200   return 0;}

 TWR-K60, Baremetal project.

Any Ideas what happened?

[Dekiru · Accepted solution]

You have to enable clock to modules before you access them, otherwise fault will happen.

Example:

/* Enable clock gate to used ports */
 SIM_SCGC5 |= SIM_SCGC5_PORTE_MASK | SIM_SCGC5_PORTB_MASK | SIM_SCGC5_PORTC_MASK;